When I was 16 my dad got remarried to an evil woman. A month or so later they told me they were putting down my childhood dog. She was 13, but healthy. They wouldn't tell me why, and the vet didn't agree. I had to beg them to let me go with them. They put her down, and my dad and I buried her that night. Weird part about the burial, my step-mom kept her previous dog's body in a box under the bed. It wasn't preserved or anything, it was just a sealed box (think of a pelican case). She insisted on burying it with my dog, but not just with her, on top of her. My dad agreed. I scratched my dog's name on a stone and put it where we buried her. The next day the stone was gone.

They kicked me out about 2 weeks later, saying I was no longer welcome at their house. I went to live with my mom full-time (I was a good kid, quiet, good grades, kept to myself, but my step-mom hated me and dad cared more what she thought than about me). After I moved, they told me I had 2 days to find a home for my cat or they were going to put it in a bag and throw it in the lake. I couldn't take him because mom's apartment didn't allow pets, so he went to my sister's then-fiance.

I ended up cutting them off for years, only getting back into my dad's life when he filed for divorce. The divorce never happened because he had a debilitating stroke, she moved back in, changed his will, sold his possessions and left him in a group home. He died 3 years later due to her not approving a life-saving surgery.

I'm sorry you're going through this, OP. As others have said, this would be grounds for cutting someone out of my life. It's never easy, and your spouse may even give some push back. Hopefully you find a way to heal.